NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Multi-band 700MHz/ 2.4GHz/ 60GHz RF front-end for radio-over-fiber base stations
RWS'10 Proceedings of the 2010 IEEE conference on Radio and wireless symposium
IEEE Standards Supporting Cognitive Radio and Networks, Dynamic Spectrum Access, and Coexistence
IEEE Communications Magazine
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In this paper, we explore spectrum field band simultaneous receivers, with a special emphasis on only one aspect of these systems - the radio front-end. We propose, to validate in the lab, a receiver scheme for the simultaneous down-conversion of two signals in different bands. Obviously, the dedicated scheme is intended for practical use in an integrated circuit. In this work, the chosen receiver is implemented with discrete components. A test set is evaluated and compared to simulations; it contains mostly standard lab equipment, processing signals, according to the receiver scheme; this receiver presents merits and it is worth demonstrating in an integrated circuit.In order to give credit to the use of this type of receiver, the EDA model and results have to be validated by measurement. Therefore, based on the receiver architecture dedicated to an 802.11/UMTS simultaneous dual-channel processing, we design and fabricate a prototype. Firstly, we measure the intrinsic metrics of this prototype in terms of noise figure, gain, linearity, phase and gain mismatch between the two branches of the quadrature mounted mixers. In the present work, we demonstrate that, for instance, as NF and IIP3 change with the RF front-end gain with the improvement of the RF front-end performance, the linearity and the noise requirements are well handled. Afterwards, these metrics are injected in the EDA receiver model and simulations are done in order to evaluate the BER evolution. To validate these simulation results by measurements, we develop a ''hardware in the loop'' method. This latter allows measuring the BER for a simultaneous 802.11g and UMTS transmission by integrating the prototype along with an RF test-bed and a real propagation channel. The BER prototype measurements validate the simulation results of IQ defaults impact on the reception quality.